I've had one of these beauties (actually an older version) since the beginning of the semester. I've used it in classrooms and to do student interviews. I rarely listen to recordings except when I can't remember those details of the next assignment the instructor always seems to give right as everyone's packing up to leave. But it's been really handy, and I love that it's easy to e-mail my notes to other students who may have missed class.
I also see a ton of educational potential for this sucker. There have already been some YouTube videos made by the company for various uses, some of which I would never use (sending students home with talking pen? really?). I see lots of applications for students who may be struggling for various reasons. If I end up getting a middle school gig I also see this as a way to post lessons for students who missed class (do you see a trend here?).
Anyway, if you take notes for any reason, I can honestly say I'm happy with my smartpen.